10 Extreme Marathons

Competing a grueling marathon isn't challenging enough for some runners.  Woman's Day has a list of ten marathons, some of them run under brutal conditions.  The picture above is from Greenland's marathon.  Others featured include a marathon run up and down the steps of the Great Wall of China, one that starts at 17,000 feet above sea level, and another run at the Dead Sea.

http://www.womansday.com/Articles/Health/Fitness-Exercise/10-Extreme-Marathons.html via The Presurfer